JPH0524433Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) This invention relates to a position indexing device.

(Prior Art) Conventionally, devices with various structures have been used to index the position of a rotary table or the like of a machine tool. For example, as a specific example,
There is a position described in the applicant's earlier application, Japanese Patent Application No. 149948/1983. In this device, as shown in FIG. 7, a discharge line 2 and a tank line 3 are connected to a drive motor 1 that drives the indexed object.
A flow direction control valve 4 is interposed between the two, and the flow direction control valve 4 is provided with a spool 5 for opening and closing a variable orifice male. Then, the drive motor 1 and the cam 6 are interlocked, and the contact 7 of the spool 5 is attached to the cam surface.
By making contact with the spool 5, the spool 5 is slid in accordance with the cam shape, and the opening degree of the variable orifice is adjusted. On the other hand, a recess 8 is formed in the cam surface, and when the contact 7 is fitted into the recess 8, the variable orifice is closed on the spool 5, and the supply of fluid to the drive motor 1 is closed. ,
The drive motor 1 is stopped at this position to perform position indexing. Further, the discharge line 2 and the tank line 3 are connected to path slot lines 10 and 11 via a forward/reverse switching valve 9, and one pilot line 10 is connected to the flow direction control valve 4.
The other pilot line 10 is connected to the pilot chamber 13 of the flow direction control valve 4, respectively. That is, when the switching valve 9 is in the neutral position, the fluid in the discharge line 2 is guided to the spring chamber 12 of the flow direction control valve 4, and the spool 5 is pushed by the fluid pressure and spring force. ,
When the contactor 7 is brought into contact with the cam surface, and the switching valve 9 is in the switching position, the fluid in the discharge line is guided into the pilot chamber 13 of the flow direction control valve 4, and the contactor 7 is brought into contact with the cam surface. It is designed to be detached from the provided recess 8.

When performing position indexing in the above device, the switching valve 9 is first moved to the switching position. Then, the fluid will be guided to the pilot chamber 13 of the flow direction control valve 4, so the spool 5 will be pushed toward the rear spring chamber 12, and the contact 7 will be removed from the recess 8 in the cam surface. Further, along with the movement of the spool 5, the flow direction control valve 4 is located at the symbol position S2, and the variable orifice is in an open state. As a result, the discharge line 2 and the tank line 3 are connected to the drive motor 1, and the drive motor 1 is rotationally driven to drive the indexed object. When the switching valve 9 is returned to the neutral position after a predetermined period of time has elapsed from the above, the fluid in the discharge line 2 is now guided to the spring chamber 12 of the flow direction control valve 4, and the spool 5 is connected to the fluid pressure and spring force. The contact 7 is pushed toward the cam 6 at the tip by this force, and the contact 7 is pressed against the cam surface by this force.
will come into contact. In this state, the flow direction control valve 4 is located at the symbol position S3, the variable orifice is in a slightly constricted state, and the drive motor 1 is slightly decelerated.

In the above device, when the contact 7 of the spool 5 reaches the vicinity of the recess 8 on the cam surface, the spool 5 is tapered by cutting off the peripheral side of the cam 6 so that the spool 5 can be gradually moved further toward the distal end. A portion 14 is formed. That is, by gradually moving the spool 5 toward the tip side, the opening degree of the variable orifice formed between the spool sliding chamber and the land end of the spool 5 in the flow direction control valve 4 is gradually reduced. , the fluid supplied to the drive motor 1 is reduced so that the drive motor 1 can be decelerated. After that, contact 7 of spool 5
When the spool 5 reaches the position of the recess 8 on the cam surface and is fitted into the recess 8, the spool 5 moves largely toward the tip side, the flow direction control valve 4 is located at the symbol position S1, and the drive motor 1 and By opening both the lines 15 and 16 connecting the flow direction control valve 4 to the tank line 3, the drive motor 1 is stopped, and the position indexing of the object to be indexed is completed.

In this type of position indexing device, the following mechanism is adopted in order to further improve the position index accuracy after the above-described position index is completed. This mechanism is also shown in FIG. 2, which shows an embodiment of this invention, and it
Ring-shaped positioning members 30, 31 are attached to positions where the base 29, which supports the indexed object 6 movably in the rotational direction and the axial direction, and the indexed object 26 face each other, and these positioning members 30, 31 has a structure in which coupling teeth that mesh with each other are provided.The object to be indexed 26 is raised and the above-described position indexing is performed with the coupling teeth disengaged, and then the object to be indexed 26 is By lowering the coupling teeth, the coupling teeth engage with each other, thereby improving position indexing accuracy.

(Problem to be solved by the invention) By the way, in the above conventional device, the object to be indexed 2
It is necessary to perform the vertical driving of the motor 6 and the rotational driving of the drive motor 1 in a set sequence. That is, the drive motor 1 cannot be started until the indexed object 26 has finished rising, and the indexed object 2 cannot be started until the drive motor 1 has stopped.
6 cannot be lowered. Therefore, conventionally, in order to detect the completion of the upward movement of the indexed object 26 or the stoppage of the drive motor 1, a limit switch (for example, the limit switch 70 in FIG. 3) is attached to an appropriate part, and from this limit switch The above sequence is secured based on the output signal of.

However, in the conventional device described above, malfunctions may occur due to failure of the limit switch or the like, or malfunctions due to noise, and the reality is that the operational reliability cannot be said to be perfect.

This invention was made in order to solve the above-mentioned conventional drawbacks, and its purpose is to provide a position indexing device with improved operational reliability during position indexing operation.

(Means for Solving the Problem) Therefore, in the position indexing device of this invention, a base 29 that supports the indexed object 26 movably in the rotational direction and the axial direction, and a base 29 and the indexed object 26 are provided.
a pair of positioning members 3 having coupling teeth that are mounted opposite to each other and mesh with each other;
0, 31, a hydraulic drive motor 21 that rotationally drives the indexed object 26, a cam 34 that rotates in synchronization with the main shaft 23 of the drive motor 21 and has a recess 41 that stops the motor 21; A direction control valve 37 that operates in conjunction with a contact 46 that cooperates with the cam 34 and stops fluid supply to the motor 21 at the position where the contact 46 is fitted into the recess 41; The axial drive means includes a cylinder 74 and a piston 75 that relatively reciprocates within the cylinder 74.
and is configured to reciprocate the indexed body 26 in the axial direction in conjunction with the relative reciprocation of the piston 75, and the cylinder 74 has openings on opposite sides via the piston 75. First and second ports 76 and 77 are provided, and the directional control valve 37 has a pair of lines 64 and 63 connected to the first and second ports 76 and 77, and a discharge line 5.
1 and the tank line 52, and in the first position S2 of this directional control valve 37, the first port 76 is connected to the discharge line 51, and the second port 76 is connected to the discharge line 51.
7 to the tank line 52, the coupling teeth of the positioning members 30 and 31 are released from engagement, while the directional control valve 3
7, the coupling teeth of the positioning members 30 and 31 are configured to mesh by communicating the second port 77 with the discharge line 51 and the first port 76 with the tank line 52, respectively, Furthermore, a third port 78 is opened in the cylinder 74, and this third port 78 can communicate with the first port 76 only in the relative movement position of the piston 75 when the directional control valve 37 is in the first position S2. The third port 78 is connected to the drive motor 21 via the line 65.

(Function) In the above position indexing device, the direction control valve 37
is placed in the first position S2 manually or by appropriate operating means, the first port 7 is located in the cylinder 74.
Fluid pressure acts from 6, which causes piston 7
5 moves relative to each other to drive the indexed body 26 in the axial direction, and the coupling teeth of the positioning members 30 and 31 are disengaged. Then, the first port 76 and the third port 78 will communicate with each other.
As a result, the drive motor 21 starts operating, and the indexed object 26 is rotationally driven.

On the other hand, when the contact 46 is fitted into the recess 41 of the cam 34 after the drive motor 21 has rotated by a predetermined angle, the directional control valve 37 interlocked with the contact 46 is located at the second position S1. Then, the first port 76 of the cylinder 74 is connected to the tank line 52, and the second port 77 is connected to the discharge line 51. As a result, first, the supply of fluid to the drive motor 21 is stopped, and the rotational drive of the indexed object 26 is stopped. On the other hand, since the second port 77 is connected to the discharge line 51, the piston 75 moves in the relative movement direction opposite to the above, and as a result,
The indexed body 26 is driven in an axial direction opposite to the above,
The coupling teeth of the positioning members 30 and 31 mesh to complete position indexing.

(Example) Next, a specific example of the position indexing device of this invention will be described in detail with reference to the drawings.

In FIGS. 2 to 4, reference numeral 21 is a double-shaft drive motor such as a trochoid motor or a gear motor having low speed and high torque characteristics, and has an upper main shaft 22 and a lower main shaft 23 at its upper and lower parts, respectively. A drive gear 25 is attached to the upper main shaft 22 via a key 24. The object 26 to be indexed, such as a rotary table, has a rotating shaft 27 fixed to the object 26 to be indexed, and a gear 28 that is fitted to the rotating shaft 27 and meshes with the drive gear 25. By the rotation of the upper main shaft 22, the indexed object 26 can be rotationally driven via a drive gear 25, a gear 28, and a rotating shaft 27, respectively.
Further, the rotating shaft 27 can move up and down with respect to a base 29 that supports the rotating shaft 27 and the indexed object 26, and positioning members are provided on the upper surface of the base 29 and the lower surface of the indexed object 26, respectively. rings 30 and 31 are attached, and these rings 3
Coupling teeth that engage with each other are formed on opposing surfaces of 0 and 31. Note that the rotation shaft 27
As will be described later with reference to FIG. 1, is assumed to be driven by a piston 75 of a hydraulic cylinder 74 to move up and down.

The lower part of the double-shaft drive motor 21 is the casing 3
2, and the lower main shaft 23 protrudes and extends inward of this casing 32. A position indexing means 33 is connected to the lower main shaft 23, so this point will be explained next.

This position indexing means 33 includes a cam 34 attached to the lower main shaft 23, an L-shaped lever 35 that swings in accordance with the shape of the cam 34, and a spool of the L-shaped lever 35 that swings in accordance with the swing of the L-shaped lever 35. 50 and a flow rate directional control valve 37 that controls the flow rate of fluid supplied to the double-shaft drive motor 21. The cam 34 is fixed to the lower main shaft 23 by a key 38 and a nut 39. A part of the circumferential side portion thereof is cut into a gentle arc shape to form a tapered portion 40, and a recessed portion 41 extending radially inward is formed at approximately the center of the tapered portion 40 in the circumferential direction. There is. That is, the circumferential side portion of the cam 34 includes an arcuate portion 42 disposed concentrically with the lower main shaft 23, and a tapered portion 40 that continues to both ends of the arcuate portion 42 and gradually extends toward the center thereof. , and a recessed portion 41 located approximately at the center of the tapered portion 40. Above L
The mold lever 35 has two arms 43 and 44 extending substantially orthogonally to each other, and is pivoted to the side wall of the casing 32 at the intersection thereof. As shown in FIG. 4, a roller 46 is rotatably supported at the tip of one arm 43 via a bearing 45, and this roller 46 can roll on the circumferential side of the cam 34. It's been like that. Note that the recess 41 provided in the cam 34 is connected to the roller 46.
The shape should be such that it can be fitted into it. In addition, the L-shaped lever 35
The tip of the other arm 44 of the
It is pivotally connected to a rod 47 that is integrally formed at the tip of the spool of the flow direction control valve 37.

As shown in FIG. 5, the flow direction control valve 37 controls the fluid supplied to the double-shaft drive motor 21 by sliding a spool 50 within a spool sliding chamber 49 provided in the main body 48. The discharge line 51 of a hydraulic pump (not shown)
Pump port P connected to tank line 5
It has a tank port T connected to the actuator side, and three ports A, B, and M connected to the actuator side. A spring 53 is interposed between the rear end of the spool 50 (right side in Figure 5) and the rear end of the main body 48, and constantly presses the spool 50 toward the tip (left side in Figure 5). It's been like that. The spring chamber 54 in which the spring 53 is housed communicates with the second pilot port PL2. A pilot chamber 55 is provided on the opposite side of the spring chamber 54, and when fluid is introduced into the pilot chamber 55, the fluid pressure in the pilot chamber 55 and the force of the spring 53 are opposite to each other. It has been like that. Note that the pilot chamber 55 communicates with the first pilot port PL1. And the first above
And the second pilot ports PL1, PL2 are connected to the forward/reverse switching valve 58 by the pilot lines 56, 57.
via the discharge line 51 and tank line 5
Connected to 2. That is, either the first or second pilot port, e.g. PL1
When the pilot port PL2 communicates with the discharge line 51, the other pilot port PL2 communicates with the tank line 52.

Each port P in the flow rate directional control valve 37,
The connection state of T, A, B, and M is as shown in FIG. That is, the spool 50 is connected to the spring 5
In the neutral state (the state shown in FIG. 5) in which the flow direction control valve 37 is pressed by the force of 3 and moved to the distal end side (the state shown in FIG. 5), the flow rate directional control valve 37 is located at the symbol position S1 (second position), and the pump port P is connected to port A, tank port T is connected to port B, and port M is blocked. On the other hand, on the contrary, the fluid pressure of the discharge line 51 is introduced into the pilot chamber 55, and when the spool 50 is in the most retracted state against the force of the spring 53, the flow rate directional control valve 37 is located at the symbol position S2 (first position), and the pump port P
is connected to port B, tank port T is connected to ports A and M
are connected to each other. In other words, at this symbol position S2, the spool 50 is retracted to the far right in FIG.
First and second through holes 50 passing through the spool 50 in the radial direction are located at the position and approximately at the center, respectively.
a, 50c are bored, and both communication holes 50
a, 50c are in communication with each other through the shaft hole 50b, so at this symbol position S2 and symbol position S3, which will be described later, the port A is connected to the first communication hole 50a, the shaft hole 50b, and the second They are communicated with the tank port T via the respective communication holes 50c. Note that both shaft ends of the shaft hole 50b are closed. Further, in the process in which the spool 50 gradually moves toward the tip side from this state, the flow direction control valve 37 is located at the symbol position S3, and the land 5 of the spool 50 is located at the symbol position S3.
The flow path of the variable orifice 36 formed between the tapered portions 9 and 60 and the corner portions 61 and 62 of the spool sliding chamber 49 is gradually narrowed. Note that when the spool 50 is moved slightly toward the tip side, the flow direction control valve 37
is located at symbol position S4, and ports A and M are blocked.

Next, a mechanism for moving the indexed object 26, such as a rotary table, up and down in the axial direction will be explained based on FIG. As mentioned above, the object 26 to be indexed is the rotating shaft 27
The lower end of the rotating shaft 27 is inserted into the cylinder 74, and
Inside this cylinder 74, the rotating shaft 2
7 is integrally formed with a piston 75.
The cylinder 74 also has a first port 76 at its lower end.
However, a second port 77 is opened at the upper end. Furthermore, a third port 78 is opened in the middle of the cylinder 74;
8 is arranged in a position that communicates with the first port 76 only when the piston 75 is in the most upwardly moved position, and is closed by the peripheral wall of the piston 75 when the piston 75 is in any other position. It is set up.

The ports A, B, and M are connected to the actuator side as shown in FIG. Further, port B is connected to the first port 76 of the cylinder 74 via line 64, and port M is connected to the dual shaft drive motor 2 via line 66.
connected to 1. and the cylinder 74
A third port 78 of is connected to drive motor 21 via line 65. Furthermore, an electromagnetic switching valve 67 for switching between normal and reverse rotation of the double-shaft drive motor 21 is interposed in the lines 65 and 66 connected to the double-shaft drive motor 21 .

And the tank line 52 and the drive motor 21
between the side line 66, that is, the drive motor 21
A bypass line 71 is formed between the front and rear of the flow rate directional control valve 37 in the return line, and a throttle 72 is formed in this bypass line 71.
is provided. The point to note here is that the diaphragm 72 is provided at a position where it can be operated from the outside of the casing 32, for example, at a position where it is exposed from the casing 32.
The reason for this will be explained later. Note that another throttle 73 is provided on the return line, but this is for regulating the maximum speed of the drive motor 21, and the opening degree of the throttle 72 of the bypass line 71 is more sufficient than that of the throttle 73. I have selected a small one.

In addition, in FIG. 3, 68 is attached to the rear end of the spool 50, and the flow direction control valve 37
a rod extending rearward through the body 48 of the
9 is a dog attached to the rear end of the rod 68, and 70 is a limit switch operated by the dog 69. These control the spool 50 when it is in its most advanced state, that is, when position indexing has been completed. Although these are for detection, it goes without saying that these can be omitted.

Next, the operating state of the above-mentioned position indexing device will be explained. First, the roller 46 provided on one arm 43 of the L-shaped lever 35 is fitted into the recess 41 of the cam 34 attached to the lower main shaft 23, and the double-shaft drive motor 21 is stopped at the index position. I will explain about it. In this case, the forward/reverse switching valve 58 is located at the neutral position, and the fluid pressure in the discharge line 51 is
It is assumed that the valve is led to the spring chamber 54 via the second pilot port PL2, and that the electromagnetic switching valve 67 is also located at the neutral position. In this state, the spool 50 is pressed toward the tip by the force of the spring 53 and the fluid pressure within the spring chamber 54. This force is applied to the rod 47 at the tip of the spool 50 and the L-shaped lever 3.
5 to the roller 46.
With this force, the cam 34 is fitted into the recess 41. In addition, since the flow rate directional control valve 37 is located at the symbol position S1 in this way, the discharge line 5
1 fluid is communicated to port A via pump port P, while port B communicates to tank line 52 via tank port T, and port M is blocked. That is, fluid supplied from port A passes through line 63 to hydraulic cylinder 7.
4, the indexed object 26 such as a rotary table is pushed down, the coupling teeth provided on the indexed object 26 side and the base 29 side are engaged with each other, and the indexed rotation position is reached. At the same time, the port B is opened to the tank line 52, and the port M is also opened to the tank line 52 via the bypass line 71. is closed, the double-shaft drive motor 21
No fluid is supplied to the motor 21, and the motor 21 is held in a stopped state.

When performing position indexing from the above state, the forward/reverse switching valve 58 is first moved to the switching position. When the forward/reverse switching valve 58 is thus moved to the switching position, the fluid in the discharge line 51 is guided to the pilot chamber 55 via the pilot line 56, while the fluid in the spring chamber 54 is guided to the tank via the pilot line 57. It is open to line 52.
As a result, the spool 50 retreats to the rear end against the force of the spring 53. Accordingly, the L-shaped lever 35 rotates, and the roller 46 moves upward and escapes from the recess 41. Moreover, as a result of the movement of the spool 50 in this way, the flow direction control valve 3
7 is located at the symbol position S2, and the discharge line 51
communicates with port B via pump port P,
On the other hand, ports A and M communicate with tank line 52 via tank port T. That is, the fluid in the discharge line 51 is transmitted to the first port 76 of the hydraulic cylinder 74 via the port B and the line 64, thereby pushing up the object 26 to be indexed, such as the rotary table, and causing the coupling teeth to mesh with each other. When the unclamping completion signal is transmitted as a result of this release, the switching valve 67 is placed in the forward rotation position. moreover,
The fluid in the discharge line 51 is connected to port B, line 6.
4. The information is transmitted to the double-shaft drive motor 21 through the first port 76, the third port 78, and the line 65, and the other line 66 communicates with the tank line 52 through the port M, so that the double-shaft drive motor 21 rotates rapidly, and as a result, the indexed body 26 is rotationally driven.

Next, after a predetermined period of time has elapsed after the switching of the forward/reverse switching valve 58, the forward/reverse switching valve 58 is returned to the neutral position again. This return operation may be performed by switching the switching valve 58 based on a signal output from the angle detector immediately before the index position, or by using a timer or the like. When the forward/reverse switching valve 58 is returned to the neutral position in this manner, the fluid in the discharge line 51 is guided into the spring chamber 54 again, and the pilot chamber 55 is communicated with the tank line 52, so that the spool 5
0 is moved toward the tip side by the fluid pressure in the spring chamber 54 and the force of the spring 53, and the L-shaped lever 3
Trying to rotate 5. However, the roller 46 at the tip of the L-shaped lever 35 has escaped from the recess 41 of the cam 34, and the cam 3 is not in the position of the roller 46.
Since the arcuate portion 42 of No. 4 is located, the roller 46 contacts this arcuate portion 42 and rolls. As a result, the spool 5 of the flow direction control valve 37
0 will be held in the middle without moving to the most extreme position. In this manner, when the flow direction control valve 37 is located at the symbol position S3, the land 59 of the spool 50,
The variable orifice 3 is formed between the tapered part 60 and the corner parts 61 and 62 of the spool sliding chamber 49.
The flow path 6 is narrower than when the spool 50 is located at the rearmost end, so the flow rate of the fluid sent to the double-shaft drive motor 21 is reduced, and the object 26 to be indexed, such as a rotary table, is , is being driven at a lower speed than at the beginning of rotation.

When the lower main shaft 23 of the double-shaft drive motor 21 further rotates and the tapered portion 40 of the cam 34 comes into contact with the roller 46, the arm 43 of the L-shaped lever 35 on the side where the roller 46 is provided
gradually approaches the lower main shaft 23 side, and the other arm 44 accordingly moves toward the flow direction control valve 3.
7, and the spool 50 gradually moves toward its tip. As a result, the flow path of the variable orifice 36 formed between the tapered portions of the lands 59, 60 of the spool 50 and the corner portions 61, 62 of the spool sliding chamber 49 is further narrowed, and the flow path is further narrowed. The flow rate of the fluid to be indexed further decreases, and the rotational speed of the indexed object 26, such as a rotary table, is reduced. In this state, the fluid in the return line from the drive motor 21 flows out through the port M into the tank line 52, and also flows out from the bypass line 71 into the tank line 52. And more spool 5
0 moves toward the tip side, the flow direction control valve 37
is located at the symbol position S4, but in this state both port A and port M are blocked, and pump port P and port B communicate through the variable orifice 36 with a small opening. That is, the fluid supplied from the discharge line 51 to the drive motor 21 is released to the tank line 52 through the restriction 72 of the bypass line 71 in the return line, and the drive motor 21 is further Slowed down.

After that, the recess 4 of the cam 34 is located at the position of the roller 46.
1, the roller 46 moves into the recess 4.
1, the L-shaped lever 35 rotates greatly, and the spool 50 of the flow direction control valve 37 projects to its most extreme position. In this state, as described above, the flow direction control valve 37 is again located at the symbol position S1, the pump port P is connected to the port A, the tank port T is connected to the port B, and the port M is blocked. Therefore, the fluid in the discharge line 51 is guided to the second port 77 of the hydraulic cylinder 74 via the line 63 and pushes down the indexed object 26 such as the rotary table, thereby separating the indexed object 26 side and the base 29 side. The coupling teeth provided on the indexable body 26 are held in a predetermined rotational index position by engaging with each other. Also, prior to this, as described above, the lines 65 and 66 leading to the double-shaft drive motor 21 are both opened to the tank line 52, so that the drive of the double-shaft drive motor 21 is stopped.

This position indexing device is capable of indexing the rotational position of the indexed object 26 as described above, but in the above device, the fluid supplied to port B of the flow direction control valve 37 is After pushing up the object 26 to be indexed, such as a rotary table, and releasing the coupling teeth provided on the side of the object 26 and the base 29, lines 64 and 65 are brought into communication and the drive motor 21 is activated. While starting, drive motor 2
Since the coupling teeth are engaged after the rotation of the coupling gear 1 is stopped, the motor 21 is not driven in the engaged state, thereby preventing damage to the coupling teeth and improving the operational reliability of the device. becomes possible. Furthermore, in the above device, during deceleration before the roller 46 on the spool 50 side fits into the recess 41 of the cam surface, the return line fluid from the drive motor 21 is supplied to the variable orifice 36 that is opened and closed by the spool 50. and a throttle 72 interposed in the bypass line 71,
The drive motor 21 is decelerated.
Since this aperture 72 is located at a location where it can be easily replaced or adjusted from outside the device casing 32,
You can replace this diaphragm 72 with one with a different opening degree,
Alternatively, the deceleration characteristics of the device can be adjusted according to the usage situation by simply adjusting the opening degree. Therefore, it is possible to always easily adjust the deceleration characteristics to suit the usage conditions of the device, and as a result, it is possible to prevent misindexes from occurring.

Although one embodiment of the position indexing device of this invention has been described above, the position indexing device of this invention is not limited to the above embodiment, and can be implemented with various modifications. For example, if it is necessary to index a plurality of positions, a plurality of recesses corresponding to the indexed positions may be provided on the circumferential side of the cam or on the disk-shaped cam surface. In addition to the above-mentioned double-shaft drive motor, a drive motor having one main shaft is used as the drive motor, and the object to be indexed is driven by this main shaft. A cam may also be installed. Furthermore, although the above example uses a flow rate directional control valve, this may be a simple directional control valve. Furthermore, although the above example shows an example in which a roller is rolled on a cam surface, it is possible to use a contact of any shape other than a roller. However, it is preferable to use the roller as described above because its durability can be improved. Further, in the above description, an L-shaped lever is used as a swinging lever for interlocking the contact and the spool, but various levers other than the L-shaped lever can be used as this coupling mechanism. Although the above example uses the fixed aperture 72, it is of course possible to use a variable aperture.

(Effect of the invention) In the position indexing device of this invention, the object to be indexed cannot be driven until the coupling teeth of the positioning member are disengaged, and the rotation of the object to be indexed is stopped. Since the coupling teeth cannot be engaged until later, a reliable operating condition can be obtained, thereby making it possible to improve the operating reliability of the device.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an example of the position indexing device of this invention, FIG. 2 is a partially cutaway front view of the position indexing device, and FIG. 3 is a cross-sectional view taken along the line of FIG. 2.
FIG. 4 is a longitudinal sectional view along the line of FIG. 3, FIG. 5 is a longitudinal sectional view showing the flow rate directional control valve used in the above device, and FIG. 6 is an explanation of the connection state of each port of the flow rate directional control valve. 7 are circuit diagrams for explaining the conventional device. 21... Double shaft drive motor, 26... Indexed object,
29... Base, 30, 31... Positioning member,
34... cam, 37... directional control valve, 41... recess, 46... contact, 50... spool, 51...
...Discharge line, 52...Tank line, 63,6
4, 65... Line, 74... Cylinder, 75...
...Piston, 76...1st port, 77...2nd port
Port, 78...Third port.

Claims (1)

[Claims for Utility Model Registration] A base 29 that supports the indexed body 26 so as to be movable in the rotational direction and the axial direction; A pair of positioning members 30 and 31 having coupling teeth that mesh with each other, a hydraulic drive motor 21 that rotationally drives the indexed object 26, and the drive motor 21.
A cam 34 having a recess 41 that rotates in synchronization with the main shaft 23 of the motor 21 and stops the motor 21, and a contact 46 that cooperates with the cam 34,
6 is fitted into the recess 41, the motor 21 has a direction control valve 37 that stops fluid supply to the motor 21, and an axial drive means that reciprocates the indexed body 26 in the axial direction, The driving means includes a cylinder 74 and a piston 75 that relatively reciprocates within the cylinder 74.
and is configured to reciprocate the indexed body 26 in the axial direction in conjunction with the relative reciprocation of the piston 75, and the cylinders 74 have openings on the reaction side of each other via the piston 75. First and second ports 76 and 77 are provided, and the directional control valve 37 has a pair of lines 64 and 63 connected to the first and second ports 76 and 77, and a discharge line 5.
1 and the tank line 52, and in the first position S2 of this directional control valve 37, the first port 76 is connected to the discharge line 51, and the second port 76 is connected to the discharge line 51.
7 to the tank line 52, the coupling teeth of the positioning members 30 and 31 are released from engagement, while the directional control valve 3
7, the coupling teeth of the positioning members 30 and 31 are configured to mesh by communicating the second port 77 with the discharge line 51 and the first port 76 with the tank line 52, respectively, Furthermore, a third port 78 is opened in the cylinder 74, and this third port 78 can communicate with the first port 76 only in the relative movement position of the piston 75 when the directional control valve 37 is in the first position S2. This third port 7
8 is connected to the drive motor 21 via a line 65.